Other assets (Tables)

12 Months Ended

Dec. 31, 2016

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other assets

Other assets consist of the following:

	As of December 31,
	2015		2016
Customer acquisition cost	$	13,458	$	30,996
Advance income and non-income taxes		50,123		60,203
Deferred transition costs		56,759		74,462
Deposits		24,107		29,853
Derivative instruments		12,096		20,657
Prepaid expenses		4,435		3,179
Accounts receivable due after one year		8,348		3,272
Others		10,679		19,706
	$	180,005	$	242,328